Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..329r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 1, 1992, p. 329-339.
Astronomy and Astrophysics
Astrophysics
45
Accretion Disks, Eclipsing Binary Stars, H Alpha Line, Stellar Systems, Emission Spectra, Spectral Line Width, Stellar Atmospheres, Stellar Envelopes, Stellar Mass Accretion, Ultraviolet Spectra
Scientific paper
The H-alpha line profile of Algol is studied in order to determine the nature of the interaction between the gas stream and the primary. Evidence is found of an asymmetric transient accretion disk with an average radius of (1.8 +/-0.2)RA, an electron density greater than about 10 exp 10/cu cm, and mass greater than 10 exp -12 solar mass. The trailing side of the disk is wider and denser than the leading side. The present theoretical calculations of the depth of the shock region produced when the gas stream strikes the primary indicate that the shock occurs above the photosphere of the star. The analyses of H-alpha and UV resonance lines show that the circumstellar material in Algol consists of four components in addition to the gas stream. It is concluded that these transient phenomena are all consequences of the impact of the gas stream on the primary star.
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